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While IXX is the Roman numeral expression for the Latin term nineteen, XIX is the more commonly used modern equivalent (see below), as in the year MMXIX , Louis XIX of France, or Super Bowl XIX.

Roman Latin was the language spoken by the Romans. The Romans did their calculating by a combination of numerals which we call the Roman numeral system. The Roman numerals for 19 are IXX or XVIIII which in Latin is called undeviginti or novemdecim respectively. A common misconception is that 19 in Roman numerals is XIX. The Roman numeral for 1/2 (one-half) looks like an S which in Latin is called semis. So half of IXX is SX (-1/2+10) because SX+SX = IXX. And half of XVIIII is VIIIIS (9+1/2) because VIIIIS+VIIIIS = XVIIII. Roman numeral values: M=1000, D=500, C=100, L=50, X=10, V=5, I=1, S=1/2.

Alternative conventionally accepted answer Roman numerals read from left to right, starting with the highest value numeral. So clearly writing 19 as XIX (10 + 9) or XVIIII (10 + 5 + 4) both follow this rule, while writing IXX (9 + 10) does not.

Q: If 19 in roman numerals is ixx or xviiii then what is half of 19 in roman numerals?

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Today the equivalent of 19 in Roman numerals are XIX But in ancient Rome they once were XVIIII or IXX In fact the Latin word for XVIIII is 'novemdecim' and the Latin word for IXX is 'undeviginti There is no equivalent Latin word for XIX

IXX is a simplified version of XVIIII which equals 19 But in today's notation of Roman numerals 19 is said to be XIX.

In todays notation of Roman numerals: XIX-VII-MMXII Note that in the Roman era 19 was XVIIII and then abridged to IXX as its Latin name suggest

V-XVIIII-MDCCCCLXXXXIIII or V-IXX-IVMM and notV-XIX-MCMXCIV

The number 019 or 19 when converted into Roman numerals is officially today considered as being XIX But the ancient Romans probably worked out the equivalent of 19 as XVIIII and simply wrote it out as IXX In fact the Latin language has words to describe XVIIII and IXX but there is no Latin word for XIX

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Today the equivalent of 19 in Roman numerals are XIX But in ancient Rome they once were XVIIII or IXX In fact the Latin word for XVIIII is 'novemdecim' and the Latin word for IXX is 'undeviginti There is no equivalent Latin word for XIX

IXX is a simplified version of XVIIII which equals 19 But in today's notation of Roman numerals 19 is said to be XIX.

In todays notation of Roman numerals: XIX-VII-MMXII Note that in the Roman era 19 was XVIIII and then abridged to IXX as its Latin name suggest

V-XVIIII-MDCCCCLXXXXIIII or V-IXX-IVMM and notV-XIX-MCMXCIV

The number 019 or 19 when converted into Roman numerals is officially today considered as being XIX But the ancient Romans probably worked out the equivalent of 19 as XVIIII and simply wrote it out as IXX In fact the Latin language has words to describe XVIIII and IXX but there is no Latin word for XIX

In todays modern notation of Roman numerals it is: XI-XIX But the ancient Romans would have worked out the equivalent of 19 as XVIIII and simplified it to IXX as confirmed in the Latin language

Because of changes made to the configuration of Roman numerals in the Middle Ages nowadays we would express 19 in Roman numerals as XIX but the ancient Romans would have probably expressed the equivalent of 19 as XVIIII or as IXX thus facilitating addition in either of the following formats-1: MDCCLXXVI+XVIIII = MDCCLXXXXV => 1776+19 = 17952: MDCCLXXVI+IXX = MDCCLXXXXV => 1776+(20-1) = 1795Note that in todays configuration of Roman numerals 1776+19 = MDCCXCVThe Latin words for XVIIII and IXX are 'novemdecim' and 'undeviginti' respectively but there is no Latin word for the equivalent of XIX.QED

In todays modern notation of Roman numerals it is XIX But there is evidence to suggest that the ancient Romans would have calculated 19 as XVIIII and simplified it to IXX (20-1) in written form.

Nowadays we would express 19 in Roman numerals as XIX but in ancient Rome the equivalent of 19 was XVIIII or IXX thus facilitating the speed and ease of addition in either of the following formats:-IXX+LXII = LXXXI => (20-1)+62 = 81LXXXI+IXX = C => 81+(20-1) = 100Alternatively:-XVIIII+LXII = LXXXI => 19+62 = 81LXXXI+XVIIII = C => 81+19 = 100Note that the Latin word for XVIIII is novemdecim and and for IXX it is undeviginti but there is no Latin word for todays notation of 19 as XIX

In todays terms: X-XIX-XCI But the ancient Romans would have worked out the equivalent of 19 as XVIIII and wrote it out as IXX

October 19, 2012 is written as XIX.X.MMXII in Roman numerals.

Because the Latin word for the Roman numerals XVIIII is novemdecim which literally means nineteen (19) and the Latin word for the numerals IXX is undeviginti which literally means one from twenty (20-1). Check it out in a Latin dictionary. The numerals XIX (there's no Latin word for this arrangement of numerals) are supposed to emulate the Hindu Arabic numerals 19 in subtractive notation. But the Roman numerals representing 19 in subtractive notation are IXX (20-1).---That being said, the currently accepted representation of 19 is indeed XIX (10 + 9), not IXX, as it is for 29 (XXIX), 39 (XXXIX), 49 (XLIX), 59 (LIX), 69 (LXIX), 79 (LXXIX), 89 (LXXXIX) and 99 (usually XCIX).